Potassium is an essential dietary mineral and has an important role as an electrolyte. Your body maintains a balance between sodium and potassium (less sodium, more potassium) which plays a vital role in regulating the fluid levels in your body. Potassium is also important for nerve and muscle function. Potassium is not destroyed by heat but some leaches into cooking water (losses about 10% for vegetables).
Remove leafy tops before storing—they pull moisture from the vegetable and impact shelf life.